Bag-sewing apparatus



May 21, 1935. A. McALlSTER BAG SEWING .APPARATUS Filed Dec. '7, 1932- 4 Sheets-Sheet 1 INVENTOR May 21, 1935. A. MCALISTER BAG SEWING .APPARATUS Filed Dec. 7,. 1952 1 45heets-Sheet 2 May 21, 1935. MCALISTER r 2,002,227

BAG SEWING APPARATUS Filed Dec. 7, 1952 4 Sheets-Sheet 5 INVENTOR;

I Attorney y 1935- A. MCALI STER 2,002,227

BAG SEWING APPARATUS Filed Dec. 7, 1932 4 Sheets-Sheet 4 NexanderMcAhA-er- \NVENT R Patented May 21. 1935 f UNITED STATES PATENT OFFICE BAG-SEWI G APPARATUS f v 1 Alexander McAlister, Darlinghurs t, near Sydney,

= New South Wales, Australia Application December 7, 1932 Serial No. 646,038 In Australia December 24, 1931 Claims. (01. 112-41) r This invention relates to apparatus for sewing Figs. 11 and 12) may be used to reciprocate the the; open mouths of bags, such as bags for needle block24 byturning a handle 43 attached carrying wheat or other materials. 7 v to an arm 44; the latter istightly fitted to the Referring .to the accompanying drawings in square portion 45 of a stud 46 which is secured 1 which the invention is illustrated, Fig. 1 is a in the crank disc 42. A linkullwis pivoted at 48 5 perspective view of the apparatus; Fig. 2 is a to the needle block24 and to the crank-disc 42 planview; Fig.- 3 is an end view looking in the by the stud 46. A look. nut 49 fits the stud direction of the arrow A of Fig. 2; Fig. 4 is a 46 to enable the link 41 and the arm 44 to be cross section on line B- C of Fig. 2; Fig. 5 is a attached in relation to the stud 46.

plan view of; ratchet mechanism for advancing The cross shaped member 29 during reciproca- 10 the bag-sewing apparatus for stitch forming option thereof. is adapted through its slots v40 to erations; Fig. 5 is a broken plan view similar to slidably? e ge a middle shouldered portion 50 Fig. 5, showing theratchetmechanism set just of atracked cam 5|. which latter is rotatable prior to an advancing movement of the sewing about astud 52 which is secured to the body 20;

apparatus; Fig. is a fragmentary sectionon the operating arm 38 with its extension 31 is 15 line D-E of Fig. 3; Fig. 8 is a detail view of a also secured by a screwed locknut 53 to an crank-pin for reciprocating the needle block of upper reduced portion 54 of the saidcam 5|; the sewing apparatus; Fig.-9 is asectional plan the'latter and the arm 38 are retained on the on line F-G otFig. 4; Fig. 10 is a part secstud 52 by a nut ,55. Should the alternative tional elevation showing a twine severing knife; crank disc 42 be used to reciprocate: the needle 20 49 the guideway to receive therein a slidable formed with an eye 63.

Fig. 11 isa fragmentary perspective view showing block .24, the said disc is rotatably fitted on the alternative means for reciprocating the needle stud 52 and is retained thereon by the screwed block; Fig. 12 is a section on line H -Iof Fig. nut 55, the tracked cam 5i being then formed 11 Fig. 13 is a perspective view of clamp means integralwith the crankdisc '42.

25 forthe open mouth of a bag to be sewn; Fig. 14 To ensure that the arm-38 may be rotatable 25 is a perspective view of the clamp in Fig. 13 only in one direction the cam Si is formed in-' clamped to the mouth of a bag; Fig. 15 is a plan teriorlywith tapering slots. 56 (see Figs. 4 and 9') of the hinged en dof the clamp shown in Fig. 13'; in which a numberof rollers 51 are furnished to and Figs. 16. 17.18 and 19 "are diagrammatic engage and firmly lock against the stud 52 to views illustrating the formation of stitches prevent rotation of the arm 38 in a direction op 30 through operations of thebagsewing apparatus. posite to the direction indicated by the arrows in Said bag-sewing apparatus is provided with a Fig. 9. The cam 5i has formedaround its cirrame or body 20 which is formed with a U-shaped cumference a grooved cam track 58 in which a channel 2| of suitable dimensions to pass longicrank pin 59 of an oscillatabletwine .looper 60 3 tudinally over the open rnouth 22 of'a bag 23 is adapted .to 'engage to enableo'scillation of the to be sewn. v A needle block 24' is slidably mountlooper during sewing operations oftheappara-tus. ed in a guide-way 25 and is'adapted to be recip- The looper is pivoted about the screwed stud rocated therein transversely of the mouth 22 of SI which is secured to a lug 62 on the channel 2|; the bag 23. There is a slotted opening 26 in the free end of the looper is .curvedand it is distance piece 21 which, together with the end Twine 64 for. sewing purposes is fed to the 28 of a cross shaped'member 29, is secured to needle 31 from and 65 carriedon a bracket 66; the needle block 24 by the screws 36. A needle the latter together with a guide plate 61 are 3|,having a hook-32 and a 'swingable tang 33 secured to thechannel 2i by screws 68. The 45 associated with said'hook, is secured to the needle twine reel 65 is supported upon the cones 69 45 block 24 by a screw34;openings 35 in the walls which are ireely'rotatable about a pin 10. A of the U-shaped channel 2| allow the needle 3| winganut. ll screwed on the pin TIE-.may be ad.- to pass therethrough. justed to apply. more or less tension on the A roller fitted crank pin 36 is mounted on the twine reel 65 by aspring l2 which isinterposed 59 extension 31 of 'anarm 38 and it is alternately between the outer cone .69 and the wing nut H. 59

adapted to engage in the oppositely disposed Twine is. fed to the needle 3| through an openslots 39 of the cross-shaped member. 29 to reing 13 in the bracket 66 to an opening 14in ciprocatei said member and the needle block 24 a. stud 15 on the channel 2|; it is then fed bewhenthe arm 38 is manually rotated through its tween the circular tension plates 16 which are handle 4}; Alternatively, a crank disc 42 (see mounted upon astud l1 projecting from the body cover plate 88.

20. The stud 11 is screwed to receive a nut is which is adjustable to press the plates I6 together with varying tension through a spring I9 interposed between the nut I8 and the outer one of the plates I5. The twine 64 is then passed from between the tension plates 16 to the eye 83 of the looper 69; then it is passed through one of the openings 35 of the channel 2I and inside such channel; in such position of the twine 64 sewing operations of the apparatus may then be commenced. a

On the completion of sewing operations the twine 64 may be cut by a swine cutter 88 which is swingable on a pivot 8| attached to one wall of the channel 2|. The cutter B8 is adapted to pass over the opening 35 through which the twine 64 enters the channel 2! by drawing on the end a of a lever 82 (see arrow, Fig. 10) which, passes through a bracket 83 located outwardly of the channel 2|, the other end of the lever 82 being pivoted at 84 to the cutter 80.

Associated with the needle block 24 is a downwardly projecting pin 85 which passes through alongitudinalslot 86 in the bottom of the guide way 25; such pin passes into a housing 81 in the body 29. The housing 8'! is closed by a cover plate 88 having an upturned edge 89.

Pivotally fitted to. the cover plate 88 on a stud 9!] is a lever- 9| having a fork 92 at one end adapted to be engaged by the downwardly projecting pin 85 of the needle block 24. Associated'with the lever 9| is a link 93 which is pivoted at 94'to the lever 9| and at 95 to an arm 96. Also. associated with the pivot 95 is a gathering ratchet pawl 91 which is actuated by a fixed spring 98. The pawl 91 is adapted to engage with the teeth 99 of and to impel a ratchet wheel I which is firmly secured to a gear wheel II. The ratchet wheel I08 and the gear wheel IIJI are rotatable about apivot I02 which is secured to the cover plate 88. Also associated with the pivot 90 of the lever 9| is a locking pawl I83 which is actuated by afixed spring I94.

The pawl I03 is' adapted to engage with and lock the ratchet wheel H18 against reverse rotation. A locking pawl I rockable about a pin I06 secured to the cover plate 88 is actuated by a pin III! in one arm of the fork 92. The pin I01 is operable in a crescent shaped opening I08 in the pawl I05 so that a tooth I09 of the latter may engage or disengage .with the teeth II 0 and lock or unlock the gear wheel IOI. A stop pin III ensures suflicient movement of the pawl I05 to lock the gear wheel IOI. Independent movement of the lever 9| is resisted by a fixed spring H2 which is adapted to engage the inclined surface II 3 of an extension of the pivot '94 (see Fig. 4).

Gear wheel IIlI is adapted to engage with a rack H4 which is secured to one member H5 of a bag clamp; The member H5 with rack II 4 is slidably engaged in the body 20 by a wall of the housing 8'! and the upturned edge 89 of the The other clamping member H6 is slidably engaged to the body 20 by the guide plate 61. The member H6 of the bag clamp is rigidly secured at one end to a plate I I "I and the other member H5 of the clamp is pivoted at H8 to the plate I ll whereby the member I I5 may be opened from the member H6 to engage the open mouth 22 of a bag 23 to be sewn. A bent anchoring pin I I9 is pivotally mounted on the plate I I1 and is adapted to be moved by an abutment I29 ion the member H5 of the clamp as the latter is opened (seedotted lines, Figs. 13 and 15). Such movement of the pin I I9 ensures easy engagement of said pin with the bag 23. The pin H9 is adapted to be placed in one end of the open mouth 22 of the bag 23 to be sewn, whereby said mouth of the bag 23 may be stretched before the members I I5 and I I6 are finally closed upon it.

Piercing pins I 2| are fitted in each member H5 and H6 of the clamp to ensure firm engagement of such members with the portions of the open mouth 22 of the bag 23; the ears of the latter are accommodated by recessed portions I 22' in the members I I5 and I I6. A swingable stirrup I23 which is pivoted at I24 to the member II 6 is adapted to engage the other member H5 when both the latter are closed over the mouth 22 of a bag 23.

The sewing operations of the apparatus will now be described with reference to the diagrammatic views shown in Figs. 16 to 19 of the drawings. The twine 64 having been threaded through the eye 63 of the looper 60 and through one of the openings 35 of the channel 2I, the needle 3I is moved forwardly (see arrow, Fig. 16) by operating eitherthe arm 38 or the arm 44 to pierce the mouth 22 of the bag 23. The tracked cam 5I has now been rotated and the looper 60 is also moved at the completion of the forward stroke of the needle 3I to draw the twine 64 across the hook 32 of the needle 3I, (see Fig. 1'7) which hook is uncovered by the tang 33, the said uncovering taking place in the forward movement of the needle 3I through the mouth 22 of the bag 23. The needle 3| is now moved rearwardly (see arrow, Fig. 18) to draw the twine 64 in a loop I 25'which is now covered by the tang 33 through the mouth 22 of the bag 23, and at the completion of this rearward stroke, the cam 5I rotates to move the looper 69 again to the position in Fig. 16. On repeating the forward movement of the needle 3| (see Fig. 19) the latter passes through the loop I25 and the mouth 22 of the bag 23 to draw the twine 64 through the loop I25 to form an: other similar loop to the latter. On the commencement of each forward stroke of the needle 3I the downwardly projecting pin 85 of the needle block 24 operates to move the sewing apparatus step by step along the bag clamp members H5 and H6 to form chain stitches (see Fig. 19).

During the piercing and looping operations (see Figs. 16, 17 and 19) the pawl I05 operates to lock the sewing apparatus upon the clamp members H5 and H6 until such operations are completed.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a bag-sewing apparatus of the character described, a needle, a looper, a needle-carrying block, a slotted cross-shaped member attached thereto, a one-way rotatable crank-like handle cooperating with said member to reciprocate said needle and block and positively to actuate said looper in operative relation with said needle, means for maintaining said needle stationary during the looping of twine thereabout, bagmouth clamping means comprising a toothed rack, and means for operating said sewing apparatus step by step with respect to said rack.

'2. Bag sewing apparatusaccording to claim 1,

in which the rotatable handle is fitted with an of the said block through rotation of said handle,

and the said cross-shaped member being also reciprocable through said crank pin and cooperating to operate the looper means during sewing operations of the apparatus.

3. Bag sewingapparatus according to claim 1, in which the rotatable handle is attached to a rotatable crank disc, the latter being pivotally connected'to the needle block whereby the said block is reciprocated through rotation of said handle, and the said crank disc is also adapted to cooperate for the purpose of operating the looper means during sewing operations of the apparatus.

4. Bag sewing apparatus according to claim 1, in which the means associated with the rotatable handle for reciprocating the needle block are associated with a one-way rotatable tracked cam which is mounted on a fixed pin, and a pin on the .twine looper is adapted to cooperate with the track of said cam to enable operation of said looper during sewing operations of theapparatus. 5. Bag sewing apparatus according to claim 1, in which the means for permitting travel of the sewing apparatus step-by-step in relation to the rack teeth of the bag clamp comprise a projecting pin from the bottom of the needle block, such pin cooperating with a pivoted forked lever carrying a pivoted link which is linked to a pivot for a toothed wheel engageable with said rack teeth, the said wheel carrying a ratchet, a spring controlled pawl for driving said wheel through said ratchet, a spring controlled pivoted pawl for said ratchet associated with the pivot for said forked lever adapted to lock said ratchet against reverse rotation, and a slotted pivoted pawl controlled through a fixed stop adapted to be moved through a projecting pin in the forked lever to lock or unlock the gear wheel cooperating with the said rack teeth.

ALEXANDER McALISTER. 

